What are absolute pressure, gauge pressure, sealed gauge pressure, and differential pressure?
In the field of pressure measurement technology, the type of pressure varies depending on the reference point (reference pressure). 【Absolute Pressure】 In absolute pressure, the process pressure is measured with a vacuum as the reference. In the manufacturing process, the back side (reference side) of the diaphragm within the sensor element is set to vacuum and sealed in that state. When atmospheric pressure is applied to the diaphragm, the sensor measures the atmospheric pressure (meteorological atmospheric pressure). All fundamental physical formulas related to pressure are based on absolute pressure data. 【Gauge Pressure】 In gauge pressure, the process pressure being measured is referenced against atmospheric pressure. In other words, it measures the difference between the process pressure and the current atmospheric pressure. Since atmospheric pressure is affected by altitude and weather, it constantly fluctuates. Therefore, for processes where variations from atmospheric pressure are significant, gauge pressure measurement is appropriate. The back of the measurement cell in gauge pressure sensors always has a vent hole, allowing the sensor element to reference atmospheric pressure within the housing. Gauge pressure is the most common type of pressure measured by pressure sensors and is used in nearly all applications and industries. For shielded gauge pressure and differential pressure, please refer to the related links below!
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Types of Pressure and Their Meanings - What are Absolute Pressure, Gauge Pressure, Sealed Gauge Pressure, and Differential Pressure?
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Our company is the Japanese branch of KELLER Pressure (Switzerland). Since its establishment, KELLER Pressure has developed and produced all its products at its factory in Winterthur, Switzerland, and is a leading manufacturer of pressure transducers and pressure transmitters, certified with ISO 9001. As a core business, we manufacture and sell over 1.3 million pressure measurement cells annually, offering products with pressure ranges from 5 mbar (500 Pa) to 2000 bar (200 MPa). With the extensive experience gained from all our products, our solutions can cater to a variety of applications. We are highly regarded as a manufacturer of high-precision pressure sensors and also accommodate OEM and custom products. We have received positive feedback from many customers. Contact: sales.jp@keller-pressure.com